Texas Instruments OPA2197IDGKT

Overview

OPA2197IDGKT from Texas Instruments is a dual-channel, 36-V precision rail-to-rail input/output operational amplifier with ±100 µV max input offset voltage, ±2.5 µV/°C max drift, 10-MHz gain-bandwidth, and 20 V/µs slew rate. It operates from ±2.25 V to ±18 V (or +4.5 V to +36 V), drives up to 1 nF capacitive loads, and is used in high-precision sensor signal conditioning and SAR ADC driver stages.

For engineers reviewing the OPA2197IDGKT datasheet, OPA2197IDGKT pinout, OPA2197IDGKT application, or OPA2197IDGKT equivalent, this page delivers verified electrical specs, package mapping to VSSOP-8, channel-specific pin functions, real-world use cases in multiplexed data acquisition and current sensing, and two validated alternative parts with documented functional trade-offs.

Technical Context

The OPA2197IDGKT integrates two independent precision op-amp channels sharing common power rails (V+ and V−) in an 8-pin VSSOP package. Each channel features EMI/RFI-filtered inputs, differential input voltage range extending to the supply rails, and robust output drive capability (±65 mA).

Its architecture supports high-voltage industrial signal chains: rail-to-rail input enables full-scale sensing across wide common-mode ranges (e.g., high-side current monitoring), while rail-to-rail output maximizes dynamic range into ADC reference buffers or precision comparators without level-shifting circuitry.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision operational amplifier applications.

Compared with OPA2192IDGKT and AD8638ARZ-REEL, the OPA2197IDGKT uniquely balances low offset drift, high output current, and full industrial temperature support-making it optimal for ruggedized data acquisition and control systems requiring consistent 16-bit accuracy across harsh environments.

Availability

OPA2197IDGKT is available at Aetrix Electronics and suitable for multiplexed data-acquisition systems, high-precision ADC driver stages, and industrial current-sensing applications requiring stable component supply and long-term manufacturability.

Supply support for OPA2197IDGKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The OPAx197 family was engineered specifically for high-voltage, high-precision industrial signal conditioning-emphasizing rail-to-rail operation, robust EMI immunity, and guaranteed performance across –40°C to +125°C.

FAQ

What is the maximum capacitive load the OPA2197IDGKT can drive without instability?

The OPA2197IDGKT is characterized to drive up to 1 nF capacitive loads while maintaining stability, as confirmed in TI's SBOS737C datasheet Figure 27–28. This capability allows direct connection to anti-aliasing filters and ADC input networks without series isolation resistors. For loads exceeding 1 nF, a small series resistor (e.g., 10–50 Ω) at the output is recommended to preserve phase margin. The OPA2197IDGKT's internal compensation is optimized for this drive strength across its full supply and temperature range.

Does the OPA2197IDGKT support single-supply operation?

Yes, the OPA2197IDGKT supports true single-supply operation from +4.5 V to +36 V, with rail-to-rail input and output swing. Its input common-mode range extends 0.1 V beyond both supply rails, enabling sensing of signals near ground or near V+. When operated from +24 V single supply, it maintains ±100 µV offset and 10-MHz bandwidth-making it ideal for industrial 24 V systems. The OPA2197IDGKT does not require dual supplies unless bipolar signal handling is needed.

What is the thermal resistance (RθJA) of the OPA2197IDGKT in its VSSOP-8 package?

The junction-to-ambient thermal resistance (RθJA) for the OPA2197IDGKT in the DGK (VSSOP-8) package is 158 °C/W, as specified in Section 6.5 of the SBOS737C datasheet. This value assumes standard JEDEC 2-layer board conditions. With a maximum junction temperature of 150°C and ambient of 85°C, the device supports up to ~410 mW of power dissipation (650 mW total for both amplifiers at 1.3 mA each). Layout best practices-including thermal vias under the exposed pad-can reduce effective RθJA by 20–30%.

How does the OPA2197IDGKT handle overload recovery?

When subjected to output overload (e.g., VIN × G = VS), the OPA2197IDGKT recovers in 200 ns, as measured in Section 6.7 of the datasheet. This fast recovery prevents signal distortion in multiplexed systems where rapid channel switching causes transient overloads. The internal architecture avoids phase reversal during overload, ensuring predictable behavior even when inputs exceed common-mode limits. This characteristic is critical in high-speed DAQ systems using the OPA2197IDGKT as a front-end buffer before an ADC multiplexer.

Is the OPA2197IDGKT pin-compatible with other devices in the OPAx197 family?

Yes, the OPA2197IDGKT shares identical pinout with the OPA2197IDR (SOIC-8) and OPA2197IPWR (TSSOP-8), and is functionally compatible with OPA197 and OPA4197 in matching channel-count packages. All dual variants use Pin 1 (OUT A), Pin 2 (–IN A), Pin 3 (+IN A), Pin 4 (V−), Pin 5 (+IN B), Pin 6 (–IN B), Pin 7 (OUT B), Pin 8 (V+). No PCB redesign is required when migrating between OPA2197 variants-only package footprint and thermal considerations differ.